I know I'm posting a lot, but I have a lot of memories...
I remember using an XT with Turbo when I was in college. Turbo made it go from 4mhz to 8mhz, I think. It was an Xtra, I don't remember who make it. I was taking a Finite Math class and we were programming in Pascal (anybody remember that?) We were doing permutations and probability. I remember kicking off a program that looped through 50k rolls of a pair of dice before I went to bed and it just finishing before I had to go to work in the morning. Now, it would run in seconds.
And to think that went to the moon with this kind of stuff..